Door-check.



No. 884,789. PATENTED APR. 14, 1908;

WLT. ADAMS,

DOOR CHECK.

APPLICATION FILED APR.17.1907

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ammwcoz Wibnwaw UNITED STATES PATENT oEEIoE.

WILLIAM T. ADAMS, OF READING, PENNSYLVANIA, ASSIGNOR TO READING HARDWARE COM- PANY, OF READING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

DOOR-CHECK.

Y Specification of Letters Patent.

I Patented April 14, 1908.

Application filed April 17, 1907. Serial No. 368,751.

the city of Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in comprises a crank-sha t 6 having a bevel gear- Door-Checks, of which the following is a specification.

My invention relates to fluid door checks such as is shown in Patent No. 727,051, issued to me May 15th, 1903, and my obj ect is to provide an improved construction whereby the fluid chamber will be more effectually and conveniently sealed by the partition plate which separates it from the spring chamber in which the piston reciprocating mechanism is mounted.

The invention is fully described in connection with the accompanying drawing and is specifically pointed out in the claims.

Figure 1 1s a sectional elevation showing -only such portions of a door check as are required to clearly present my present improvements. Fig. 2 is a separate view of the clamping and sealing ring.

The general features of the check illustrated are well known, comprising a cylindrical check-casing 1, formed with an upper spring-chamber 2, and a fluid-chamber 3 below it which is provided with a piston 4 in its reduced lower end, and with mechanism for' reciprocating said piston located above the latter; said mechanism being operated by a door-connected shaft 5 which rises axially through the upper chamber 2 and may be ro tatably connected with a coiled spring therein. The piston reci rocating mechanism 7 arranged in mesh with a bevel-pinion 8 on said shaft 5, all arranged and operated as indicated in my prior patent referred to.

In order to insure the continued satisfactory operation of these fluid checks it is important that the fluid chamber be effectually sealed by the partition plate 10 which separates it from the spring-chamber 2, and that said plate should at the same time provide proper support for the shafts 5 and 6 of the piston reciprocating mechanism; and my present invention relates merely to the improved construction shown whereby these ends are more satisfactorily attained. The fluid preferably employed in the chamber 3 (as mixed alcohol and glycerin) is so volatile as to be liable to an objectionable reduction in quantity after a check has been in service for a considerable time, because of loss through the partition plate joints and openings ordinarily provided, especially in view of the great disturbing strains to which the plate is subjected by the piston-reciprocating mechanism which it carries, in controlling the movement of heavy and carelessly handled doors. In my improved construction the outer edge 11 of the plate 10, which is seated in the circular recess or counterbore 12 of the chambers 3 below the offset 13 at the junction of the larger diameter chamber 2 and the smaller diameter chamber 3, is overlapped by the inner edge 14 of a clampingand-sealing ring 15, which is exteriorly screwthreaded to engage the interiorly screwthreaded lower wall portion 16 of the chamher 2; said overlapping portion of the screwring 15 bearing all around upon the raised surface of the partition plate 10, while the portion thereof beyond said plate clears the offset 13 sufficiently to insure a free clamping action upon the plate and at the same time provide a shallow sealing space 17 in which any suitable sealing material may be compressed by the clamping action. This manner of securing the plate 10 insures an absolutely fluid tight connection of the latter with thecasing, maintaining permanently an effective sealing pressure at all portions of the rim of the plate notwithstanding the strains exerted upon the latter in operating the piston, while at the same time greatly reinforcing the plate. The depending bearings 20, 21 for the crank shaft are cast integral with the plate 10 as shown so as to be perfectly rigid and tight; while the axial bearings 22 through which passes the pinion-shaft 5, is provided with a packing gland 23, and said shaft 5 is provided with a circular groove 24 within the bearing 22, and with a lateral opening 25 and axial opening 26 affording communication between said groove and the fluid chamber 3, so that the tendency of the fluid to work up between the shaft and its bearing and to ultimately escape, will be overcome by collecting it in said groove and draining it back into the fluid chamber.

By means of the improved construction thus specifically described the fluid chamber in said counterbore with its upper surface above the oflset at the junction with the upper chamber and provided with depending bearings for the piston-reciprocating mechanism, and a screw-ring in said upper chamber adapted to clamp and seal said partition plate, substantially as set forth.

In testimony whereof, I a'fIiX my signature, in the presence of two Witnesses.

WILLIAM T. ADAMS. Witnesses:

GEO. E. TYSON, W. G. STEWART. 

